Process of forming lime compositions



25 proportions of sulphur to the lime may be varied 2. A process o Producing a lime product which 35 Patented Dec. 15, 1936 UNITED I STATES. PATENT OFFICE Charles I. Chubbuck, San Marilif No Drawing. Application December 12, 1553: If l Serial N- 702,029

6 Claims. (01. 106-24) V p This invention relates to lime compositions used sufficiently to expel all the free arkeg m in preparing mortar or plaster for coating walls water. The product should then be groun g jj or the like, and a process for preparing the same. pulverized. l;

An object of the present invention is to provide The product may be also prepared by adding a lime product which when packed in bags or the sulphur to lime putty (already slaked) mix- 5 other porous containers may be stored for long ing same and then heating sufiiciently to drive periods without deteriorating. off the free and combined water, then grinding Another object is to provide a composition of the product. the character stated that will remain substan- In the two preceding methods all the combined tially cool when slaked and which will set in a water need not be expelled to make a satisfac- 10 manner similar to calcined gypsums. tory product. I have also found that the addi- Another object is to provide a lime product tion of /2 of. 1% to 3% of sodium sulphate imwhich when made into mortar for plastering proves the material. (scratch or brown coat) will carry from four to The sulphur may be added to hydrated lime six parts sand by weight, which may be applied and the mixture heated sufficiently to expel the 15 immediately after mixing and which will rapidly combined water, the resulting product then beset after application. ing ground.

A further object is to provide a lime product I claim: which may be used for white coating without 1. Aprocess of producinga lime product which the admixture of, any gypsum plaster. consists of adding 1% to of sulphur to the 2 The process of forming the product may be lime during the period of slaking, heating the carried out in various ways as follows: resultant lime putty sufiiciently to drive off the A quantity of pure or natural limestone and free and combined water, and finally grinding sulphur is first finely ground or pulverized. The the product.

from 1% to 30% according to the product desired. consists f adding t0 of ulphur t0 the The products thus pulverized are then thorlime during the period Of SIB/king, heating d ve oughly mixed and alci During calcining a ofi the free water and a portion of. the combined certain amount of the sulphur combines with the water, and finally grinding the product.

30 lime and results in formation of sulphides. The A p ss f p u i a lime product which 30 resultant product is then reground and may be consists in adding 1% to 30% of sulp o a lime packed in suitable containers for storage or di- P tty, a g to d ve Off the free and combined rectly for use. During calcining it would appear water, and finally grinding the product. that most or all ofv the sulphur present would 4- A process of producing a lime p duc W ich become volatilized and driven off by the temperaconsists in adding 1% to 30% of sulphur to a lime 5 ture in the calcining furnace, but it has been putty. ing o drive 01T the free water and a found in actual practice that a certain portion portion of the combined water, and finally dof it combines with the lime and forms sulphides g he p Oductas above stated. 5. The process of providing a lime product 40 A similar product may be prepared by adding which consists in adding 1% to 30% of sulphur 40 sulphur in the above quantities to ground limeto hydrated lime, and finally heating the mixstone and suificient lime putty in order that the ture to drive off the combined water. mixed products will become cohesive. The mix- 6. The process of providing a lime product ture is then calcined and ground. which consists in adding 1% to 30% of. sulphur to The product may be prepared by adding the hydrated lime, and finally heating the mixture 45 sulphur to lime (calcium oxide) during the procto drive ofi a portion of the combined water. ess of slaking and the putty thus formed heated C. I. CHUBBUCK. 

